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Old 2010-07-23, 23:18   #1
science_man_88
 
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Default The Elements

This is a book by Theodore Gray(copyright 2009), in it are multiple errors even I the idiot can pick out for one it shows coppers melting point to be below 0 on it's temperature scale, second it list technetium and promethium as the 2 exceptions to the fact that all elements below bismuth are stable but they both have atomic numbers< bismuth hence they are above it.
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Old 2010-07-24, 04:21   #2
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Quote:
Originally Posted by science_man_88 View Post
second it list technetium and promethium as the 2 exceptions to the fact that all elements below bismuth are stable but they both have atomic numbers< bismuth hence they are above it.
The book is correct there. Perhaps you have confused the meanings of "below" and "above" in this context.

"Below" in this context means having a lesser atomic number, not being vertically farther "down" on the two-dimensional periodic table in the orientation with which it's usually displayed. Hydrogen is "below" every other element.

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Old 2010-07-24, 12:06   #3
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that phrasing should be abolished I think as it never got told that was it in any chemistry class I ever took.

what about the copper melting below 0 Celsius ? according to Wikipedia it melts at over 1000 Celsius and that's quite a big lie if the book is accurate.
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Old 2010-07-24, 12:59   #4
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Most people don't need Wikipedia to check that copper melts above 0 Celsius.
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Old 2010-07-24, 13:02   #5
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Most people don't need Wikipedia to check that copper melts above 0 Celsius.
I didn't either but I just give references that show above 0 is accurate but below is crazy unless it's at a high pressure.
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Old 2010-07-24, 13:07   #6
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Can I guess that it says the melting point is -38.83 °C? Possibly mixed up with mercury.
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Old 2010-07-24, 13:12   #7
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Quote:
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Can I guess that it says the melting point is -38.83 °C? Possibly mixed up with mercury.
I can't tell it shows it in a scale on the side with 500 degree increments marked.

looks to me like 91 K but that's only a guess.
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Old 2010-07-24, 14:30   #8
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I didn't either but I just give references that show above 0 is accurate but below is crazy unless it's at a high pressure.
There is a basic error in this statement. I leave it to you to find it.
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Old 2010-07-24, 14:37   #9
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if it's punctuation I don't care almost nobody I know does everything accurately.
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Old 2010-07-24, 14:45   #10
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if it's punctuation I don't care almost nobody I know does everything accurately.
No, it's not punctuation, spelling or grammar.
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Old 2010-07-24, 15:09   #11
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very low pressure maybe?
remember.. water boil at 95 °C high in the mountain

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